A magnetic roller for spinning and a spinning method

Abstract

The present invention belongs to the field of spinning technology, and relates to a spinning magnetic roller and a spinning method. The spinning magnetic roller comprises a main shaft, a magnetic ring a, a magnetic ring b, a floating shaft, a first limiting plate, a first fixed ring, and a first AC power supply, a frequency converter and an electric control cabinet connected in sequence; the floating shaft is fixedly sleeved on the magnetic ring b, the magnetic ring b is sleeved on the magnetic ring a, and the two repel each other, and the magnetic ring a is fixedly sleeved on the main shaft; the first limiting plate is fixedly connected to the left end of the main shaft, the first fixed ring is fixedly sleeved on the left end of the floating shaft, and the first fixed ring is located at the right end of the first limiting plate; the right surface of the first limiting plate is provided with a first electromagnet connected to the first AC power supply, and the outer surface of the first fixed ring is provided with a first magnetic block opposite to the first electromagnet on the left and right; the spinning method adopts the above-mentioned spinning magnetic roller, and the first AC power supply is started during the spinning process to make the floating shaft rotate. The spinning magnetic roller of the present invention has low noise, can rotate autonomously, and is suitable for wire guiding in the spinning process.

Description

Technical Field

[0001] The invention belongs to the technical field of spinning, and in particular relates to a magnetic roller for spinning and a spinning method. Background Art

[0002] Filament is a type of morphology. In the process of chemical fiber manufacturing, the spinning fluid is continuously extruded from the spinneret hole, cooled by air or coagulated into filaments in a coagulation bath to become continuous filaments, and then passes through the wire guide device to enter the post-processing steps such as stretching.

[0003] In filament production, pneumatic wire guide disc is a widely used wire guiding method. Pneumatic wire guide disc uses compressed air to suspend the filament bundle and rotates with the operation of the filament bundle, providing wire guiding function in actual production.

[0004] CN118348929A discloses a method for improving the quality of POY-FDY polyester composite yarn, wherein a speed sensor is installed on the outer roller shell of the pneumatic wire separator roller, and the outer roller speed of the pneumatic wire separator roller is monitored in real time by a central processor and data processing is performed; a solenoid valve is installed on a hose connected to the compressed air main pipeline, and the central processor controls the size of the compressed air intake by controlling the opening of the solenoid valve, thereby stably controlling the speed of the pneumatic wire separator roller. However, on the one hand, this pneumatic wire guide disk consumes a large amount of compressed air, which is costly, and the airflow of the compressed air will also generate a large noise. At the same time, since the pneumatic wire guide disk has an air outlet at the other end, it will also affect the stability of the yarn bundle in the hot box to a certain extent; on the other hand, this pneumatic wire guide disk cannot rotate autonomously, but can only rotate passively by relying on the operation of the yarn bundle. There is friction resistance between the pneumatic wire guide disk and the yarn bundle, which not only causes noise between the pneumatic wire guide disk and the yarn bundle, but also makes the running speed of the yarn bundle unstable, and the yarn bundle often slips, skips, breaks, etc., affecting the stability and efficiency of filament production.

[0005] Therefore, it is necessary to study a wire guide device and a wire guide method which are low in cost, low in noise and can rotate autonomously. Summary of the invention

[0006] The purpose of the present invention is to solve the above problems existing in the prior art and to provide a magnetic roller for spinning and a spinning method.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A magnetic roller for spinning, characterized in that it comprises a main shaft, a magnetic ring a, a magnetic ring b, a floating shaft, a first limit plate, a first fixed ring, a first AC power supply, a frequency converter and an electric control cabinet;

[0009] The floating shaft has a hollow structure and is fixedly sleeved on the magnetic ring b, the magnetic ring b is sleeved on the magnetic ring a, the two repel each other and the distance between them is constant, and the magnetic ring a is fixedly sleeved on the main shaft;

[0010] With the axial direction of the main shaft as the left and right direction, the first limit plate is fixedly connected to the left end of the main shaft, the first fixed ring is fixedly sleeved on the left end of the floating shaft, and the first fixed ring is located at the right end of the first limit plate and the two are arranged at a distance;

[0011] The right surface of the first limit plate is provided with n first electromagnets which are evenly distributed around the central axis of the main shaft, have alternating magnetic poles, and are all connected to the first AC power supply. The outer surface of the first fixed ring is provided with n first magnetic blocks which are evenly distributed around the central axis of the main shaft, have alternating magnetic poles, and are opposite to the first electromagnets on the left and right. n is a positive integer in the interval [8, 16]. The first AC power supply, the frequency converter and the electric control cabinet are connected in sequence.

[0012] The principle of the present invention is as follows:

[0013] The magnetic ring a and the magnetic ring b use the same magnetic properties, and a repulsive force is formed between the magnetic ring a and the magnetic ring b. This repulsive force makes the floating shaft suspend on the main shaft. The magnetic force between the first electromagnet and the first magnetic block evenly distributed around the main shaft can also make the floating shaft suspend on the main shaft.

[0014] The first AC power supply controls the magnetic field direction of the first electromagnet to change continuously, forming an alternating magnetic field. The first magnetic block rotates under the action of the alternating magnetic field, thereby driving the floating shaft to rotate. When the floating shaft rotates, there is no contact or friction between the floating shaft and the main shaft, and the noise is small.

[0015] The first AC power supply is adjusted to synchronize the rotation speed of the floating shaft with the running speed of the filament bundle, so that the filament bundle passes through the floating shaft without friction resistance, the noise between the floating shaft and the filament bundle is small, the running speed of the filament bundle is stable, and the filament bundle will not slip, jump, break, etc. Moreover, the filament bundle is supported by the floating shaft, and there is no need to suspend the filament bundle with compressed air, thus avoiding the consumption of a large amount of compressed air, which is beneficial to energy saving and cost reduction, and also prevents compressed air from affecting the stability of the filament bundle running in the hot box.

[0016] As the priority technical solution:

[0017] The magnetic roller for spinning as described above further comprises a second limiting plate, a second fixing ring and a second AC power supply;

[0018] The second limit plate is fixedly connected to the right end of the main shaft, the second fixing ring is fixedly sleeved on the right end of the floating shaft, the second fixing ring is located at the left end of the second limit plate and the two are arranged at a distance;

[0019] The left surface of the second limit plate is provided with m second electromagnets which are evenly distributed around the central axis of the main shaft, have alternating magnetic poles, and are all connected to the second AC power supply. The outer surface of the second fixed ring is provided with m second magnetic blocks which are evenly distributed around the central axis of the main shaft, have alternating magnetic poles, and are opposite to the second electromagnets on the left and right. m is a positive integer in the interval [8, 16]. The second AC power supply, the frequency converter, and the electric control cabinet are connected in sequence.

[0020] In this way, both ends of the floating shaft will have magnetic effect with the electromagnet, and the floating shaft can better overcome its own gravity, which not only makes the floating shaft more stably suspended on the main shaft, but also both ends of the floating shaft are affected by the alternating magnetic field, and the rotation of both ends of the floating shaft is more stable.

[0021] In the above-mentioned spinning magnetic roller, the floating shaft is made of carbon fiber, which is light in weight and helps the floating shaft to be suspended on the main shaft.

[0022] In the above-mentioned spinning magnetic roller, the surface roughness Ra of the floating shaft is 0.7-0.8 μm, which is beneficial to further reduce the resistance between the filament bundle and the floating shaft, making the running speed of the filament bundle more stable.

[0023] As described above, the spinning magnetic roller has a cylindrical structure for the main shaft and the floating shaft, so that the floating shaft can be better suspended on the main shaft, which can avoid friction and collision between the main shaft and the floating shaft on the one hand, and make the contact between the running filament bundle and the rotating floating shaft more stable on the other hand.

[0024] In the above-mentioned magnetic roller for spinning, the first limiting plate and the second limiting plate are both porous plates.

[0025] The present invention also provides a spinning method using a spinning magnetic roller as described in any one of the above items, wherein the first AC power supply and / or the second AC power supply is started during the spinning process to cause the floating shaft to rotate.

[0026] As the preferred technical solution:

[0027] According to the spinning method as described above, during the spinning process, the first AC power supply and / or the second AC power supply are controlled so that the floating shaft rotates at a speed of 300-3000 m / min; the running speed of the yarn bundle (the linear speed of the hot roller) is generally set to 300-3000 m / min. Since the pneumatic separator roller rotates with the yarn bundle without power, under ideal conditions, the linear speed of the pneumatic separator roller rotating with the yarn bundle is also 300-3000 m / min. However, when the pneumatic separator roller rotates with the yarn bundle at a high speed or there is oil on the pneumatic separator roller, the speed of the pneumatic separator roller cannot keep up with the speed of the yarn bundle, making the yarn bundle prone to slipping, skipping, and breaking on the hot roller; the linear speed of the magnetic roller for spinning The speed and the linear speed of the hot roller can be consistent in theory. When setting the parameters of the magnetic roller for spinning, the operating voltage of the electromagnet of the magnetic roller for spinning is controlled by adjusting the value of the frequency converter connected to the AC power supply (frequency range 5-50Hz, corresponding to the working voltage range of the electromagnet 38-380V, working current range 0.01-0.1A, working power 0.38-38W), thereby changing the current of the electromagnet and changing the magnetism of the electromagnet. Finally, the magnetic force is used to control the linear speed of the magnetic roller for spinning to reach 300-3000m / min, which is consistent with the running speed of the tow, so that the tow runs smoothly, which is conducive to avoiding slipping, wire jumping, and broken ends of the tow.

[0028] Beneficial effects:

[0029] (1) The main shaft and floating shaft of the spinning magnetic roller of the present invention are non-contact, and the floating shaft produces little noise when rotating;

[0030] (2) The spinning magnetic roller of the present invention realizes the autonomous rotation of the floating shaft by controlling the AC power supply, which can keep the rotation speed of the floating shaft consistent with the running speed of the filament bundle, ensuring that there is no friction resistance between the floating shaft and the filament bundle when the filament bundle passes through the floating shaft. This not only reduces the noise between the floating shaft and the filament bundle, but also stabilizes the running speed of the filament bundle, prevents the filament bundle from slipping, skipping, breaking, etc., and improves the wire guiding efficiency.

[0031] (3) The spinning magnetic roller of the present invention does not require compressed air, has low cost, and does not produce airflow noise. It also avoids the airflow affecting the stability of the filament bundle running in the hot box.

[0032] (4) The spinning method of the present invention can achieve frictionless operation of the floating shaft and the filament bundle by adjusting the AC power supply, and the operation steps are simple, which is conducive to large-scale application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic structural diagram of the magnetic roller for spinning of the present invention;

[0034] Figure 2It is a schematic diagram of spinning using the spinning magnetic roller of the present invention;

[0035] Among them, 1 is the first limit plate, 2 is the first electromagnet, 3 is the main shaft, 4 is the magnetic ring a, 5 is the magnetic ring b, 6 is the first magnetic block, 7 is the floating shaft, 8 is the second magnetic block, 9 is the second electromagnet, 10 is the second limit plate, 11 is the first fixed ring, 12 is the second fixed ring, 13 is the hot roller, 14 is the magnetic roller for spinning, 15 is the wire guide disk, 16 is the electric control cabinet, 17 is the frequency converter, and 18 is the insulation box. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0037] Example 1

[0038] like Figure 1 The magnetic roller for spinning shown in the figure is composed of a first limit plate 1, a first electromagnet 2, a main shaft 3, a magnetic ring a 4, a magnetic ring b 5, a first magnetic block 6, a floating shaft 7, a first fixed ring 11, a first AC power supply, a frequency converter 17 and an electric control cabinet 16;

[0039] The floating shaft 7 has a hollow structure and is fixedly sleeved on the magnetic ring b 5, the magnetic ring b 5 is sleeved on the magnetic ring a 4, the two repel each other and the distance between them is constant, and the magnetic ring a 4 is fixedly sleeved on the main shaft 3;

[0040] With the axial direction of the main shaft 3 as the left and right direction, the first limit plate 1 is fixedly connected to the left end of the main shaft 3, the first fixed ring 11 is fixedly sleeved on the left end of the floating shaft 7, and the first fixed ring 11 is located at the right end of the first limit plate 1 and the two are arranged at a distance;

[0041] The first electromagnet 2 is fixed on the right surface of the first limit plate 1. The number of the first electromagnets 2 is eight and they are evenly distributed around the central axis of the main shaft 3, with alternating magnetic poles, and are all connected to the first AC power supply. The first AC power supply, the frequency converter 17 and the electric control cabinet 16 are connected in sequence. The magnetic force range of the first electromagnet 2 is 0.2-2kg, and the frequency of the frequency converter 17 is 5-50Hz (corresponding to a magnetic force of 0.2-2kg); the first magnetic block 6 is fixed on the outer surface of the first fixed ring 11. The number of the first magnetic block 6 is eight and they are evenly distributed around the central axis of the main shaft 3, with alternating magnetic poles and opposite to the first electromagnet 2 on the left and right;

[0042] The floating shaft 7 is made of carbon fiber, and the surface roughness Ra of the floating shaft 7 is 0.8 μm. The main shaft 3 and the floating shaft 7 are both cylindrical structures, and the first limiting plate 1 is a six-hole plate.

[0043] like Figure 2 A spinning method is shown, after the filament bundle enters the insulation box 18, it passes through the spinning magnetic roller 14, the hot roller 13, and the wire guide disk 15 of this embodiment in sequence, and then comes out of the insulation box 18. The running speed of the filament bundle is set to 800m / min. The type of the filament bundle is polyester FDY and POY composite yarn, and the specification is 150dtex / 108f. During the spinning process, the first AC power supply is started through the electric control cabinet 16 and the inverter 17 (the electric control cabinet 16 is responsible for receiving the control signal and transmitting it to the inverter 17, and the inverter 17 adjusts the frequency and voltage of the output first AC power supply according to the control signal), so that the floating shaft 7 rotates, and the frequency value of the control inverter 17 is controlled to be 13.3Hz, and the working voltage of the first electromagnet 2 is 101.3V, so that the linear speed of the floating shaft 7 rotation is 800m / min, and the full winding rate of the spinning position is 99.0%, and the noise within 1 meter of the spinning position is 48 decibels.

[0044] Comparative Example 1

[0045] A spinning method, which differs from the spinning method of Example 1 in that the magnetic roller for spinning is replaced by a pneumatic separation roller for separation, and the full winding rate of the spinning position obtained is 98.2%, and the noise within 1 meter of the spinning position is 85 decibels.

[0046] Example 2

[0047] like Figure 1 A magnetic roller for spinning shown in the figure is composed of a first limit plate 1, a first electromagnet 2, a main shaft 3, a magnetic ring a 4, a magnetic ring b 5, a first magnetic block 6, a floating shaft 7, a second magnetic block 8, a second electromagnet 9, a second limit plate 10, a first fixed ring 11, a second fixed ring 12, a first AC power supply, a second AC power supply, a frequency converter 17 and an electric control cabinet 16;

[0048] The floating shaft 7 has a hollow structure and is fixedly sleeved on the magnetic ring b 5, the magnetic ring b 5 is sleeved on the magnetic ring a 4, the two repel each other and the distance between them is constant, and the magnetic ring a 4 is fixedly sleeved on the main shaft 3;

[0049] With the axial direction of the main shaft 3 as the left and right direction, the first limit plate 1 is fixedly connected to the left end of the main shaft 3, the first fixed ring 11 is fixedly sleeved on the left end of the floating shaft 7, and the first fixed ring 11 is located at the right end of the first limit plate 1 and the two are arranged at a distance;

[0050] The first electromagnet 2 is fixed on the right surface of the first limit plate 1. The number of the first electromagnets 2 is sixteen and they are evenly distributed around the central axis of the main shaft 3, with alternating magnetic poles, and are all connected to the first AC power supply. The first AC power supply, the frequency converter 17 and the electric control cabinet 16 are connected in sequence; the first magnetic block 6 is fixed on the outer surface of the first fixed ring 11. The number of the first magnetic block 6 is sixteen and they are evenly distributed around the central axis of the main shaft 3, with alternating magnetic poles and opposite to the first electromagnet 2 on the left and right;

[0051] The second limit plate 10 is fixedly connected to the right end of the main shaft 3, the second fixed ring 12 is fixedly sleeved on the right end of the floating shaft 7, the second fixed ring 12 is located at the left end of the second limit plate 10 and the two are arranged at a distance; the second electromagnet 9 is fixed on the left surface of the second limit plate 10, the number of the second electromagnet 9 is sixteen and they are evenly distributed around the central axis of the main shaft 3, the magnetic poles are alternating, and they are all connected to the second AC power supply, and the second AC power supply, the frequency converter 17 and the electric control cabinet 16 are connected in sequence; the second magnetic block 8 is fixed on the outer surface of the second fixed ring 12, the number of the second magnetic block 8 is sixteen and they are evenly distributed around the central axis of the main shaft 3, the magnetic poles are alternating and they are opposite to the second electromagnet 9 on the left and right;

[0052] The magnetic force range of the first electromagnet 2 and the second electromagnet 9 is 0.2-2kg, and the frequency of the frequency converter 17 is 5-50Hz (corresponding to a magnetic force of 0.2-2kg);

[0053] The position of the first magnetic block 6 corresponds one-to-one to the position of the second magnetic block 8, which is conducive to the two ends of the floating shaft to synchronously obtain electromagnetic force for rotation;

[0054] The floating shaft 7 is made of carbon fiber, and the surface roughness Ra of the floating shaft 7 is 0.7 μm. The main shaft 3 and the floating shaft 7 are both cylindrical structures, and the first limiting plate 1 and the second limiting plate 10 are both six-hole plates.

[0055] like Figure 2 A spinning method is shown, after the filament bundle enters the insulation box 18, it passes through the spinning magnetic roller 14, the hot roller 13, and the wire guide disk 15 of this embodiment in sequence, and then comes out of the insulation box 18. The type of the filament bundle is polyester FDY and POY composite yarn, the specification is 150dtex / 108f, the filament bundle running speed is set to 3000m / min, and the first AC power supply and the second AC power supply are started through the electric control cabinet 16 and the inverter 17 during the spinning process. The frequency value of the inverter 17 is controlled to be 50Hz, the working voltage of the first electromagnet 2 and the second electromagnet 9 is 380V, and the linear speed of the floating shaft 7 rotation is 3000m / min. The full winding rate of the spinning position is 98.9%, and the noise within 1 meter of the spinning position is 47 decibels.

[0056] Comparative Example 2

[0057] A spinning method, which differs from the spinning method of Example 2 in that the magnetic roller for spinning is replaced by a pneumatic filament separation roller for filament separation, and the obtained spinning position full roll rate is 97.6%, and the noise within 1 meter of the spinning position is 86 decibels.

[0058] Example 3

[0059] like Figure 1 A magnetic roller for spinning shown in the figure is composed of a first limit plate 1, a first electromagnet 2, a main shaft 3, a magnetic ring a 4, a magnetic ring b 5, a first magnetic block 6, a floating shaft 7, a second magnetic block 8, a second electromagnet 9, a second limit plate 10, a first fixed ring 11, a second fixed ring 12, a first AC power supply, a second AC power supply, a frequency converter 17 and an electric control cabinet 16;

[0060] The floating shaft 7 has a hollow structure and is fixedly sleeved on the magnetic ring b 5, the magnetic ring b 5 is sleeved on the magnetic ring a 4, the two repel each other and the distance between them is constant, and the magnetic ring a 4 is fixedly sleeved on the main shaft 3;

[0061] Taking the axial direction of the main shaft 3 as the left and right direction, the first limit plate 1 is fixedly connected to the left end of the main shaft 3, the first fixed ring 11 is fixedly sleeved on the left end of the floating shaft 7, the first fixed ring 11 is located at the right end of the first limit plate 1 and the two are arranged at a distance; the first electromagnet 2 is fixed on the right surface of the first limit plate 1, the number of the first electromagnet 2 is twelve and they are evenly distributed around the central axis of the main shaft 3, the magnetic poles are alternating, and they are all connected to the first AC power supply, the first AC power supply, the frequency converter 17 and the electric control cabinet 16 are connected in sequence; the first magnetic block 6 is fixed on the outer surface of the first fixed ring 11, the number of the first magnetic block 6 is twelve and they are evenly distributed around the central axis of the main shaft 3, the magnetic poles are alternating and they are opposite to the first electromagnet 2 on the left and right;

[0062] The second limit plate 10 is fixedly connected to the right end of the main shaft 3, the second fixed ring 12 is fixedly sleeved on the right end of the floating shaft 7, the second fixed ring 12 is located at the left end of the second limit plate 10 and the two are arranged at a distance; the second electromagnet 9 is fixed on the left surface of the second limit plate 10, the number of the second electromagnet 9 is twelve and they are evenly distributed around the central axis of the main shaft 3, the magnetic poles are alternating, and they are all connected to the second AC power supply, and the second AC power supply, the frequency converter 17 and the electric control cabinet 16 are connected in sequence; the second magnetic block 8 is fixed on the outer surface of the second fixed ring 12, the number of the second magnetic block 8 is twelve and they are evenly distributed around the central axis of the main shaft 3, the magnetic poles are alternating and they are opposite to the second electromagnet 9 on the left and right;

[0063] The magnetic force of the first electromagnet 2 and the second electromagnet 9 ranges from 0.2 to 2 kg, and the frequency of the frequency converter 17 is 5 to 50 Hz (corresponding to a magnetic force of 0.2 to 2 kg);

[0064] The position of the first magnetic block 6 is misaligned to correspond to the position of the second magnetic block 8, which is beneficial for both ends of the floating shaft 7 to obtain electromagnetic force in turn for rotation;

[0065] The floating shaft 7 is made of carbon fiber, and the surface roughness Ra of the floating shaft 7 is 0.8 μm. The main shaft 3 and the floating shaft 7 are both cylindrical structures, and the first limiting plate 1 and the second limiting plate 10 are both six-hole plates.

[0066] like Figure 2 A spinning method is shown, after the filament bundle enters the insulation box 18, it passes through the spinning magnetic roller 14, the hot roller 13, and the wire guide disk 15 of this embodiment in sequence, and then comes out of the insulation box 18. The type of the filament bundle is polyester FDY and POY composite yarn, the specification is 150dtex / 108f, the filament bundle running speed is set to 2000m / min, and during the spinning process, the first AC power supply and the second AC power supply are started by the electric control cabinet 16 and the inverter 17, the value of the control inverter 17 is 33.3Hz, the working voltage of the first electromagnet 2 and the second electromagnet 9 is 253.3V, so that the linear speed of the floating shaft 7 rotation is 2000m / min; the obtained spinning position full roll rate is 98.6%, and the noise within 1 meter of the spinning position is 45 decibels.

[0067] Comparative Example 3

[0068] A spinning method, which differs from the spinning method of Example 3 in that the magnetic roller for spinning is replaced by a pneumatic filament separation roller for filament separation, and the obtained spinning position full roll rate is 98.3%, and the noise within 1 meter of the spinning position is 88 decibels.

[0069] From the above, it can be seen that the spinning method of the comparative example 1-3 using the pneumatic filament separation roller has a full roll rate of 97.6%-98.3%, and the noise within 1 meter of the spinning position is 85-88 decibels; while the spinning method of the embodiment 1-3 of the present invention using the spinning magnetic roller has a full roll rate of 98.6%-99.0%, and the noise within 1 meter of the spinning position is 45-48 decibels. After comparison, it can be seen that the full roll rate of the spinning position of the embodiment 1-3 of the present invention is greatly improved, and the noise of the spinning position is also greatly reduced, which is beneficial to improving the working environment of the operators and preventing occupational diseases.

Claims

1. A magnetic roller for spinning, characterized in that: It includes a main shaft, a magnetic ring a, a magnetic ring b, a floating shaft, a first limit plate, a first fixed ring, a first AC power supply, a frequency converter and an electric control cabinet; The floating shaft has a hollow structure and is fixedly sleeved on the magnetic ring b, the magnetic ring b is sleeved on the magnetic ring a, the two repel each other and the distance between them is constant, and the magnetic ring a is fixedly sleeved on the main shaft; With the axial direction of the main shaft as the left and right direction, the first limit plate is fixedly connected to the left end of the main shaft, the first fixed ring is fixedly sleeved on the left end of the floating shaft, and the first fixed ring is located at the right end of the first limit plate and the two are arranged at a distance; The right surface of the first limit plate is provided with n first electromagnets which are evenly distributed around the central axis of the main shaft, have alternating magnetic poles, and are all connected to the first AC power supply. The outer surface of the first fixed ring is provided with n first magnetic blocks which are evenly distributed around the central axis of the main shaft, have alternating magnetic poles, and are opposite to the first electromagnets on the left and right. n is a positive integer in the interval [8, 16]. The first AC power supply, the frequency converter and the electric control cabinet are connected in sequence.

2. A spinning magnetic roller according to claim 1, characterized in that: It also includes a second limiting plate, a second fixing ring and a second AC power supply; The second limit plate is fixedly connected to the right end of the main shaft, the second fixed ring is fixedly sleeved on the right end of the floating shaft, the second fixed ring is located at the left end of the second limit plate and the two are arranged at a distance; The left surface of the second limit plate is provided with m second electromagnets which are evenly distributed around the central axis of the main shaft, have alternating magnetic poles, and are all connected to the second AC power supply. The outer surface of the second fixed ring is provided with m second magnetic blocks which are evenly distributed around the central axis of the main shaft, have alternating magnetic poles, and are opposite to the second electromagnets on the left and right. m is a positive integer in the interval [8, 16]. The second AC power supply, the frequency converter and the electric control cabinet are connected in sequence.

3. A spinning magnetic roller according to claim 2, characterized in that: The floating axle is made of carbon fiber.

4. A spinning magnetic roller according to claim 3, characterized in that: The surface roughness Ra of the floating shaft is 0.7-0.8μm.

5. A spinning magnetic roller according to claim 2, characterized in that: The main shaft and the floating shaft are both cylindrical structures.

6. A spinning magnetic roller according to claim 2, characterized in that: The first limiting plate and the second limiting plate are both porous plates.

7. A spinning method using a spinning magnetic roller as claimed in any one of claims 2 to 6, characterized in that: During the spinning process, the first AC power source and / or the second AC power source are started to make the floating shaft rotate.

8. A spinning method according to claim 7, characterized in that: During the spinning process, the first AC power source and / or the second AC power source are controlled so that the floating shaft rotates at a speed of 300-3000 m / min.

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